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Dielectric Properties of Polymers

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Dear Colleagues,

At present, polymer materials are widely used in various industries due to their excellent properties. Nowadays, electronic equipment is subjected to more requirements due to its superior features such as high complexity. Traditional dielectric materials cannot meet the new requirements. Polymer materials have become the preferred materials in electrical engineering due to their excellent dielectric properties. Therefore, it is necessary to study the dielectric properties of polymer materials. This mainly depends on the dielectric properties of the interface region. This Special Issue aims to collect articles and review papers on the study of polymer dielectric properties. Scholars are welcome to actively contribute.

Dr. Dinara Sobola
Guest Editor

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19 pages, 15280 KiB

Open AccessArticle

Correlation of Dielectric Properties and Vibrational Spectra of Composite PVDF/Salt Fibers

by Rashid Dallaev, Ranjini Sarkar, Daud Selimov, Nikola Papež, Pavla Kočková, Richard Schubert, Klara Častková, Farid Orudzhev, Shikhgasan Ramazanov and Vladimír Holcman

Polymers 2024, 16(17), 2412; https://doi.org/10.3390/polym16172412 - 26 Aug 2024

Viewed by 1561

Abstract

Nitride salts were added to polyvinylidene fluoride fibers and then the fiber mats were prepared by electrospinning. An experimental investigation of the structure was provided by Raman, FTIR, SEM, and XRD. The phase ratio of the polymer was studied both theoretically and experimentally in connection with the addition of the hydrates Mg(NO₃)₂, Ca(NO₃)₂, and Zn(NO₃)₂ salts. The comparison of simulated and experimental data for vibrational spectroscopies is discussed. We provide a comparison of triboelectric, dielectric, and compositional characterization of PVDF fibers doped with three types of nitride hydrates. Doping of PVDF fibers with magnesium nitrate hexahydrate leads to significant improvement of the triboelectric performance. Full article

(This article belongs to the Special Issue Dielectric Properties of Polymers)

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14 pages, 3878 KiB

Open AccessArticle

Crown Ether Copolymerized Polyimide Film: Enhanced Mechanical, Thermal Properties and Low Dielectric Constant under High Frequency

by Heming Li, Xinming Wang, Ziyang Ding, Weiguo Gao, Yan Liu, Ke Ma, Zhizhi Hu and Yongqi Wang

Polymers 2024, 16(9), 1188; https://doi.org/10.3390/polym16091188 - 24 Apr 2024

Cited by 2 | Viewed by 1623

Abstract

Polymer materials with a low dielectric constant and low dielectric loss have the potential to be applied to high-frequency signal transmissions, such as mobile phone antennas and millimeter wave radars. Two types of diamines, 4,4′-diamino-p-tetraphenyl (DPT) and crown ether diamine (CED), were prepared for ternary copolymerization with BPDA in this study. Cross-links with molecular chains were formed, increasing molecular chain distance by utilizing rings of CED. The MPI films exhibit a good thermal performance with the increase in CED addition, with Tg > 380 °C and CTE from −4 × 10⁻⁶ K⁻¹ to 5 × 10⁻⁶ K⁻¹. The Young’s modulus can reach 8.6 GPa, and the tensile strength is above 200 MPa when 5% and 7% CED are introduced. These MPI films exhibit good mechanical performances. The dielectric constant of PI−10% film can go as low as 3.17. Meanwhile, the relationship between dielectric properties and molecular structure has been demonstrated by Molecular Simulation (MS). PI molecules are separated by low dielectric groups, resulting in a decrease in the dielectric constant. Full article

(This article belongs to the Special Issue Dielectric Properties of Polymers)

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18 pages, 5416 KiB

Open AccessArticle

Electrical Characterization of Epoxy Nanocomposite under High DC Voltage

by Ammar Alsoud, Samer I. Daradkeh, Saleh R. Al-Bashaish, Adel A. Shaheen, Ahmad M. D. (Assa’d) Jaber, Adel M. Abuamr, Marwan S. Mousa and Vladimír Holcman

Polymers 2024, 16(7), 963; https://doi.org/10.3390/polym16070963 - 2 Apr 2024

Cited by 17 | Viewed by 2228

Abstract

This work studies the direct current breakdown characteristics of unfilled epoxy and epoxy nonconductive nanocomposites (

{S i O}_{2}, M g O

and

{A l}_{2} O_{3}

). It also examines the variation of electrical properties in epoxy nanocomposites. The [...] Read more.

This work studies the direct current breakdown characteristics of unfilled epoxy and epoxy nonconductive nanocomposites (

{S i O}_{2}, M g O

and

{A l}_{2} O_{3}

). It also examines the variation of electrical properties in epoxy nanocomposites. The novel aspect of this study is that the samples of Epoxy nanocomposite were exposed to high voltages of up to six kilo volts for three hours using field electron microscopy under high vacuum conditions (

10^{- 5}

mbar). The current emitted from these samples was measured at three different intervals of time. In addition, the influence of high voltage on the permittivity, loss factor (tan(δ)), and conductivity of the epoxy nanocomposite was studied. This evaluation was conducted before and after applying the voltage at room temperature, The frequency range extends from

10^{- 2}

–

10^{- 7}

Hz using the Novo Control Alpha-A analyzer. Current–voltage characterization was performed through field electron microscopy. The samples were characterized by scanning electron microscopy–energy dispersive X-ray spectroscopy and Fourier Transform Infrared Spectroscopy. The unfilled epoxy exhibited structural degradation, resulting in the formation of holes when exposed to high voltages of up to six kilo volts, leading to a reduction in electrical properties. Nevertheless, the addition of nanoparticles shows a significant increase in the operational lifetime of the epoxy nanocomposite. The degree of increase in the lifetime of epoxy composite varied depending on several factors such as the type of NPs introduced and their respective sizes. The epoxy/

{A l}_{2} O_{3}

nanocomposite comparing with epoxy/MgO and epoxy/

{S i O}_{2}

nanocomposite showed elevated resistance to direct current breakdown strength and maintaining its dielectric. Full article

(This article belongs to the Special Issue Dielectric Properties of Polymers)

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